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Subject[PATCH 4.10 082/110] PCI: Add ACS quirk for Intel Union Point
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Williamson <alex.williamson@redhat.com>

[ Upstream commit 7184f5b451cf3dc61de79091d235b5d2bba2782d ]

Intel 200-series chipsets have the same errata as 100-series: the ACS
capability doesn't follow the PCIe spec, the capability and control
registers are dwords rather than words. Add PCIe root port device IDs to
existing quirk.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pci/quirks.c | 28 ++++++++++++++++++++++++----
1 file changed, 24 insertions(+), 4 deletions(-)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4151,15 +4151,35 @@ static int pci_quirk_intel_pch_acs(struc
*
* N.B. This doesn't fix what lspci shows.
*
+ * The 100 series chipset specification update includes this as errata #23[3].
+ *
+ * The 200 series chipset (Union Point) has the same bug according to the
+ * specification update (Intel 200 Series Chipset Family Platform Controller
+ * Hub, Specification Update, January 2017, Revision 001, Document# 335194-001,
+ * Errata 22)[4]. Per the datasheet[5], root port PCI Device IDs for this
+ * chipset include:
+ *
+ * 0xa290-0xa29f PCI Express Root port #{0-16}
+ * 0xa2e7-0xa2ee PCI Express Root port #{17-24}
+ *
* [1] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-2.html
* [2] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-1.html
+ * [3] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-spec-update.html
+ * [4] http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-spec-update.html
+ * [5] http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-datasheet-vol-1.html
*/
static bool pci_quirk_intel_spt_pch_acs_match(struct pci_dev *dev)
{
- return pci_is_pcie(dev) &&
- pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
- ((dev->device & ~0xf) == 0xa110 ||
- (dev->device >= 0xa167 && dev->device <= 0xa16a));
+ if (!pci_is_pcie(dev) || pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
+ return false;
+
+ switch (dev->device) {
+ case 0xa110 ... 0xa11f: case 0xa167 ... 0xa16a: /* Sunrise Point */
+ case 0xa290 ... 0xa29f: case 0xa2e7 ... 0xa2ee: /* Union Point */
+ return true;
+ }
+
+ return false;
}

#define INTEL_SPT_ACS_CTRL (PCI_ACS_CAP + 4)

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